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The engine bleed air systems are located on the engine and withi

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"High pressure bleed air comes from the 5th stage of the HPC."

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"Low pressure bleed air comes from the 9th stage of the HPC."

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The pneumatic system provides pressure for the potable water sys

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The pneumatic system controls the temperature and the pressure o

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Air is obtained from engine bleed, APU, or from an external grou

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The APU check valve prevents reverse flow to the APU during engi

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The 737-400 has two more overwing exits than the 737-300.

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The 737-300 has a body stretch of 120 inches,a wing tip extensio

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B737 has fully-monocoque fuselage and semi-retractable landing g

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